Results 201 to 210 of about 27,886 (261)

Transition Metal Complexation in 1,3-Dipolar Cycloadditions

HETEROCYCLES, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
BROGGINI, GIANLUIGI, MOLTENI G, TERRANEO A, ZECCHI, GAETANO ALDO   +3 more
openaire   +5 more sources

Access to Imidazolidines via 1,3-Dipolar Cycloadditions of 1,3,5-Triazinanes with Aziridines.

Journal of Organic Chemistry, 2019
The unprecedented 1,3-dipolar cycloaddition of 1,3,5-triazinanes and aziridines has been described. With readily available starting material, this method offers efficient access to a wide range of functionalized imidazolidine derivatives in moderate to ...
Liang Tu, Zhenghui Li, Tao Feng, Shuyan Yu, Rong Huang, Jing Li, Wen-Xuan Wang, Yongsheng Zheng, Jikai Liu   +8 more
semanticscholar   +1 more source

Double 1,3-Dipolar Cycloadditions of Two Nonstabilized Azomethine Ylides for Polycyclic Pyrrolidines.

Organic Letters, 2019
Nonstabilized azomethine ylides derived from decarboxylation of oxazolidin-5-ones were used for double 1,3-dipolar cycloadditions in diastereoselective synthesis of pyrrolidine-containing tetracyclic compounds.
Xiaofeng Zhang, W. Qiu, Jason J Evans, M. Kaur, J. Jasinski, Wei Zhang   +5 more
semanticscholar   +1 more source

Boryl Azides in 1,3-Dipolar Cycloadditions

The Journal of Organic Chemistry, 2014
The 1,3-dipolar cycloaddition reaction of boron azides with alkynes has been investigated experimentally and computationally. At room temperature pinBN3 (pin = pinacolato) reacts with the strained triple bond of cyclooctyne with formation of an oligomeric boryl triazole.
Holger F. Bettinger, Matthias M. Müller, Cäcilia Maichle-Mössmer   +2 more
openaire   +3 more sources

1,3-Dipolar Cycloadditions of 4-Acetoxy Allenoates: Access to 2,3-Dihydropyrazoles, 2,3-Dihydroisoxazoles, and Indolizines.

Organic Letters, 2015
The thermal 1,3-dipolar cycloadditions of 4-acetoxyallenoates 1 with various dipoles have been reported. When azomethine imines and nitrones are used as the 1,3-dipole partner, the corresponding reactions afford 2,3-dihydropyrazole and 2,3 ...
Falin Li, Jiangfei Chen, Yading Hou, Yujie Li, Xin‐Yan Wu, Xiaofeng Tong   +5 more
semanticscholar   +1 more source

1,3-Dipolar Cycloadditions in Aqueous Media

HETEROCYCLES, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
openaire   +4 more sources

Organocatalytic enantioselective 1,3-dipolar cycloadditions between Seyferth-Gilbert reagent and isatylidene malononitriles: synthesis of chiral spiro-phosphonylpyrazoline-oxindoles.

Organic Letters, 2015
A new method has been developed for the catalytic enantioselective 1,3-dipolar cycloaddition of the Seyferth-Gilbert reagent (SGR) to isatylidene malononitriles using a cinchona alkaloid derivative as a catalyst.
Taiping Du, Fei Du, Yanqiang Ning, Yungui Peng   +3 more
semanticscholar   +1 more source

Diastereoselective 1,3-Dipolar Cycloadditions of N,N'-Cyclic Azomethine Imines with Iminooxindoles for Access to Oxindole Spiro-N,N-bicyclic Heterocycles.

Organic Letters, 2016
In the presence of CuI, 1,3-dipolar cycloadditions of N,N'-cyclic azomethine imines with iminooxindoles proceeded readily and furnished novel oxindole spiro-N,N-bicyclic heterocycles in moderate to excellent chemical yields with excellent ...
Hong‐Wu Zhao, Bo Li, Hailiang Pang, Ting Tian, Xiao-Qin Chen, Xiu-qing Song, W. Meng, Zhao Yang, Yu-Di Zhao, Yue-Yang Liu   +9 more
semanticscholar   +1 more source

Facile Synthesis of Indolizines via 1,3-Dipolar Cycloadditions in [Omim]Br: The Promotion of the Reaction through Noncovalent Interactions

, 2017
Various indolizines are synthesized through one-pot, two-step 1,3-dipolar cycloadditions in recyclable [Omim]Br with high yields and a broad substrate scope.
Xiao Zhang, Guo-ping Lu, Zhu-bing Xu, C. Cai   +3 more
semanticscholar   +1 more source

Isoquinolino[4,3,2-de]phenanthridine: synthesis and its use in 1,3-dipolar cycloadditions to form nitrogen-containing polyaromatic hydrocarbons.

Chemical Communications, 2015
The synthesis of the novel azomethine ylide, isoquinolino[4,3,2-de]phenanthridine, and its use in 1,3-dipolar cycloaddition with various alkenes and alkynes to form the corresponding fused pyrrolidines and pyrroles is reported.
Shingo Ito, Yuki Tokimaru, Kyoko Nozaki
semanticscholar   +1 more source